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Showing content from https://lists.gnu.org/archive/html/emacs-devel/2022-11/msg01170.html below:

Re: An interesting line-motion bug.

From: Karl Fogel <kfogel@red-bean.com>
Date: Wed, 16 Nov 2022 23:38:32 -0600

;; When you hit that breakpoint, point will already be on the newline ;; at the end of the line ";; in a buffer in which" above. By then, ;; that newline has a display property that makes it look wide to ;; Emacs -- specifically, one unit wider than a newline normally is.
;; But Emacs never asked whether the display property is on a
;; *newline*.  In other words, Emacs identifies this as a wide
;; character and thus mistakenly computes a "width" that actually
;; extends over a vertical (because newline) span.

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